Malicious PDF — malware analysis report

Static analysis result for SHA-256 168b387f5cad6b38…

MALICIOUS

PDF

80.1 KB Created: 2021-03-17 01:08:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cdea58081d215e3c02618e422c8696b9 SHA-1: 5f06ed7ca067034fc5cf080f1b38b261ae1fe7d2 SHA-256: 168b387f5cad6b382b4aceda5cc681849fa215b88a148d23f472935b57f6d79e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. The embedded URL, https://jumiwimov.ru/123?utm_term=baixar+whatsapp+plus+transparente+apk, suggests a lure to download an application, likely malicious, disguised as a WhatsApp Plus APK. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further indicates a phishing or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/123?utm_term=baixar+whatsapp+plus+transparente+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489415/normal_5fd1a2de8bc56.pdfIn PDF document text
    • http://burrrhey.tech/rurebonidumijoji6fdw3.pdfIn PDF document text
    • http://gouliwer.online/how_to_turn_on_garmin_gps_7292ge0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_603b0c0891319.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5ff2b16d52c2c.pdfIn PDF document text
    • http://lovepositions.info/puwivexofiocpin.pdfIn PDF document text
    • http://savadaqwe.space/83848863414x4m2w.pdfIn PDF document text
    • http://powogole.iblogger.org/os_axiomas_de_zurique.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/18fde821-0c2a-4033-8ad0-48f0011452a4/78280825316.pdfIn PDF document text
    • http://jusaketij.rf.gd/chinna_chinna_sethi_solli_song_starmusiq.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ced4bb-5c92-41d9-ba94-ebc536e0bda9/what_is_connect_id_in_peoplesoft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d367018-b41b-4b1f-8aeb-48a644436298/logistics_and_supply_chain_management_certificate_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5425bf7b-36db-4881-b54e-67a8e050e386/64325240828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/606ef79c-5f48-446a-923f-016a73fff8bf/que_hace_mecanica_industrial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a5058f-c013-4684-9270-bdf96353afcf/theseus_and_the_minotaur_hades.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 4952 bytes
SHA-256: 73e7df608a10654385f4af403d05414df82834eae9bcb900d60212395e411c9f
font_01_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 12616 bytes
SHA-256: b5ee78830e084e4bd5fb244afaff5a3774077d732845f982c905c4196f4a24cd
font_02_sfnt_off000123ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123ED 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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